<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
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    <link type="text/css" rel="stylesheet" href="css/catalog.css" />
    <title>目录</title>
</head>

<body>
    <button class="back" onclick="routerBackFn()">返回</button>
    <div id="intro">
    </div>
    <div id="cata">
    </div>
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</body>

</html>